Not sure what the editor is all about but I used to do stuff with regular cameras.. Turn the hud off.
Sadly don't have my first gta montages but I do have a sleeping dogs one.
https://youtube.com/watch?v=9vAIi6laFQk
They were a lot of fun. I liked to make it a story involving a chase haha.
I did this one stunt in gta, strap the bike with c4, jump off and detonate when it hits a car.
I'll Get back into again some day.